Abstract:

Stability of bisphenol A(BPA)in high-temperature water(HTW)was studied in fused silica capillary reactor(FSCR, ID1.0 mm).It was found that the stability of BPA was influenced by both temperature and heating time obviously.At 260—360℃，4.7—18.7 MPa and heating time of 15 min, the recovery of BPA decreased from 87.8％ to 11.1％.At 260℃ and heating time of 15—75 min, the recovery of BPA decreased from 87.8％ to 43.5％.It was noted that the wall effects of the batch autoclave promoted the decomposition of BPA by comparing the experiment results of FSCR and batch autoclave.Additional kinetic analysis suggested that BPA in HTW followed a first-order reaction kinetics with activation energy of 76.1 kJ·mol^-1.Upon examination in water inside a FSCR(ID0.3 mm)under a microscope, phase changes were observed when BPA was heated.It started to melt at a low temperature, then dissolved completely in water above 219℃ and eventually became an aqueous fluid coexisting with vapor phases.